<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="js/vue.js"></script>
</head>
<body>
  <div id="app">
    <input type="text" placeholder="请输入名字" v-model="keyWord">
    <div>
      <ul>
        <li v-for="(p, index) in keyValue" :key="p.id">
          {{p.name}} - {{p.age}} - {{p.sex}}
        </li>
      </ul>
    </div>
  </div>
  <script>
    Vue.config.productionTip = false;  //阻止开发模式下提示
    //用watch实现
    //#region
    /* var vm = new Vue({
      el: '#app',
      data: {
        persons: [
          {id: 001,name: '马冬梅',age: 19,sex: '女'},
          {id: 002,name: '周冬雨',age: 20,sex: '女'},
          {id: 003,name: '周杰化',age: 21,sex: '男'},
          {id: 004,name: '温找伦',age: 22,sex: '男'}
        ],
        keyWord: '',
        filPersons: [],
      },
      watch: {
        keyWord:{
          immediate: true,
          handler(val) {
            this.filPersons = this.persons.filter((item) => {
              return item.name.indexOf(val) != -1 ;
            });
          }
        }
      }
    }); */
    //#endregion
    //用computed实现
    var vm = new Vue({
      el: '#app',
      data: {
        persons: [
          {id: 001,name: '马冬梅',age: 19,sex: '女'},
          {id: 002,name: '周冬雨',age: 20,sex: '女'},
          {id: 003,name: '周杰化',age: 21,sex: '男'},
          {id: 004,name: '温找伦',age: 22,sex: '男'}
        ],
        keyWord: ''
      },
      computed: {
        keyValue() {
          return this.persons.filter(item => {
            return item.name.indexOf(this.keyWord) != -1;
          })
        }
      }
    })
  </script>
</body>
</html>